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Wow, that does sound unflattenable! Odd, I thought Charnleys were supposed to be harder than Llyn Idwals, though I suppose there's a lot of variation for natural stones like these.

On a slightly...

What have you tried lapping it with?

I've got what I believe to be a Llyn Idwal on the way to me - but fortunately it's supposed to have already been lapped flat.

Ah, I got that PHIG was probably an acronym, but since "WHIG" was spelled "Whig", I assumed it must be the actual name of a hone (though not one I'd use, for, as Samuel Johnson remarked, the first...

Never heard of a Whig hone.